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City of Tukwila: Background Report for the Transportation Element of the Comprehensive Plan Update <br />Transportation Analysis and 2030 Improvement Recommendations <br />May 2012 <br />TRANSPORTATION SAFETY <br />The City of Tukwila provided collision data on city-owned streets for a six year span between 2004 and <br />2009 for the following analysis. During this period, the Tukwila police department received reports of <br />1,409 collisions. These collisions resulted in four fatalities, 372 injuries, and 1,077 property-damage only <br />Tables 56 <br />(PDO) collisions. and summarize the number of collisions occurring at each roadway <br />3 <br />segment and intersection for those locations that fell above the citywide average collision rate. <br />Table 5 <br />As shown in the , the citywide average collision rate for roadway segments is 1.63 collisions per <br />million vehicle miles of travel (MVMT). In comparison, the 2009 Washington State Collision Data <br />Summary (WSDOT 2010) found the statewide urban area average collision rate to be 2.03 collisions per <br />Table 6 <br />MVMT and the King County average collision rate to be 2.17 collisions per MVMT. shows the <br />Tukwila citywide average intersection collision rate is 0.40 collisions per million entering vehicles (MEV). <br />WSDOT does not publish intersection collision rates. <br />The collision data indicated that there was a collision involving a fatality at each of the following study <br />locations over the six year analysis period: <br /> The intersection of S 124th Street & 42nd Avenue S <br /> Along Interurban Avenue S between Southcenter Boulevard and 58th Avenue S (midway <br />between Southcenter Boulevard and I-5) <br /> Along E Marginal Way S between S 130th Street and S 128th Stree <br /> <br /> <br />3 <br /> Collision rates were calculated on 23 roadway segments and at 5intersections by dividing the total number of collisions per <br />facility by the total traffic flow at the facility over the six year analysis span. Six year average traffic flows were estimated using 2009 <br />PM peak hour traffic volumes and peak hour-daily and daily-annuaconversion factors. This analysis assumes no change in traffic <br />flow over the past six years, which is reasonable given the historical traffic trends discussed in the next section. Citywide average <br />collision rates were calculated based on the volume-weighted collision rates for both intersections and roadway segments. <br /> 18 <br /> <br /> <br />